问题 解答题

某停车场中有三轮农用车、四轮中巴车和六轮大卡车共44辆,各种轮子共有171个,已知四轮中巴车比六轮大卡车的2倍少一辆,那么这个停车场中共有多少辆三轮农用车?

答案

设六轮大卡车有x辆,则四轮中巴车有(2x-1)辆,三轮农用车就有44-x-(2x-1)=44-3x+1辆,

由题意可得方程:

6x+4×(2x-1)+3×(44-3x+1)=171,

             6x+8x-4+132-9x+3=171,

                       5x+131=171,

                   5x+131-131=171-131,

                           5x=40,

                            x=8,

44-3x+1=44-3×8+1=21(辆);

答:这个停车场共有三轮农用车21辆.

单项选择题 A1/A2型题
单项选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop"

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) She had only one small, flat bag with a few candies—fiftycent candies I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

8().

A.effort 

B.room 

C.time 

D.money